package cn.tedu.sp06.fb;

import cn.tedu.web.util.JsonResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * 商品的降级代码
 */
@Component
@Slf4j
public class ItemFB implements FallbackProvider {
    /**
     * 设置针对那个后台服务进行降级
     * item-service: 只针对商品服务进行降级
     * "*" ：对所有
     * @return
     */
    @Override
    public String getRoute() {
        return "item-service";
    }

    /*
    向客户端发回的降级响应
    ---错误提示
    ---缓存数据
    ---根据业务逻辑返回数据
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();//状态码
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();//状态文本
            }

            @Override
            public void close() {
                //用来关闭下面的输入流
                //BAIS  虚拟机中读取byte[]数组
            }

            @Override
            public InputStream getBody() throws IOException {
                String json = JsonResult.err().code(500).msg("后台服务出错了").toString();
                //用BAIS 封装结果
                return new ByteArrayInputStream(json.getBytes("utf-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h = new  HttpHeaders();
                h.add("Content-Type","application/json;charset=utf-8");
                return h;
            }
        };
    }
}
